The macrocyclic polyether -amide (1) is shown to be mere selective than its corresponding monocyclic analogue (4) for the Ca2+ ion; the potentiometric selectivity for Ca2+ relative to Mg2+ is improved by more than one order of magnitude.
K. Kimura, K. Kumami, S. Kitazawa and T. Shono, J. Chem. Soc., Chem. Commun., 1984, 442 DOI: 10.1039/C39840000442
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